Biggest pair ive ever had my hands around, were those of a Polish WG named Isabel in Southend on Sea, probably arpund 8 yrs ago now. Curvy girl, big bum and thighs, little bit of a belly but not big. Couldnt say what size they were as was too long ago now, but they were huge. Big dark areolas and great big nipples too.
Civvy wise, a girl i was seeing about 10 years ago. She was a 36E at the time, and they were a big ol' pair! But before id met her she had a breast reduction so god knows how big they were before!